Canon 18x50 IS All Weather specs and field of view
Eighteen times magnification narrows the view to 195 ft (at 1,000 yd), or 3.7 degrees, a tight field for a Canon IS model. The twilight factor works out to 30.
- Field of view
- 195 ftat 1,000 yd
- Eye relief
- 15 mm
- Close focus
- 19.7 ft
- Weight
- 41.6 oz
- Exit pupil
- 2.8 mmcalculated
Why pick it
- Image stabilized
Who the 18x50 IS All Weather suits
Distant detail such as craters on the Moon or far shorelines suits the 18x power. Eye relief is 15 mm, and the body is listed as water resistant for heavy rain.
The 2.8 mm calculated exit pupil is small for dusk, and at 41.6 oz with a 19.7 ft close focus it asks for steady, deliberate use.
18x50 IS All Weather aside, the most popular models of all sizes are in our best binoculars comparison.
18x50 IS All Weather specifications
18x50 IS All Weather figures as Canon prints them; rows marked * are calculated from the 18x50 size.
| Magnification | 18x |
|---|---|
| Objective lens | 50 mm |
| Prism type | Porro |
| Field of view | 195 ft at 1,000 yd (65 m at 1,000 m) |
| Angular field of view | 3.7° |
| Apparent field of view | 60.3° |
| Eye relief | 15 mm |
| Close focus | 19.7 ft (6 m) |
| Weight | 41.6 oz (1,180 g) |
| Length | 7.6 in (193 mm) |
| Width | 6 in (152 mm) |
| Waterproofing | Water Resistant (Usable in heavy rain) |
| Image stabilization | Yes |
| Exit pupil | 2.8 mm * |
| Twilight factor | 30 * |
| Relative brightness | 7.7 * |
* Calculated from the size, not printed by the maker.
Other sizes of the Canon IS
Canon makes the Canon IS in 10 sizes; a larger front lens adds brightness and weight, and more magnification narrows the view.
| Model | Size | Field of view | Eye relief | Close focus | Weight | Exit pupil |
|---|---|---|---|---|---|---|
| Canon 18x50 IS All Weather | 18x50 | 195 ft | 15 mm | 19.7 ft | 41.6 oz | 2.8 mm |
| Canon 8x20 IS | 8x20 | 345 ft | 13.5 mm | 6.6 ft | 14.8 oz | 2.5 mm |
| Canon 10x20 IS | 10x20 | 279 ft | 13.5 mm | 6.6 ft | 15.2 oz | 2 mm |
| Canon 10x30 IS II | 10x30 | 315 ft | 14.5 mm | 13.8 ft | 21.2 oz | 3 mm |
| Canon 10x32 IS | 10x32 | 315 ft | 14.5 mm | 6.6 ft | 27.5 oz | 3.2 mm |
| Canon 12x32 IS | 12x32 | 261 ft | 14.5 mm | 6.6 ft | 27.5 oz | 2.7 mm |
| Canon 14x32 IS | 14x32 | 225 ft | 14.5 mm | 6.6 ft | 27.3 oz | 2.3 mm |
| Canon 12x36 IS III | 12x36 | 287 ft | 14.5 mm | 19.7 ft | 23.3 oz | 3 mm |
| Canon 10x42 L IS WP | 10x42 | 342 ft | 16 mm | 8.2 ft | 39.2 oz | 4.2 mm |
| Canon 15x50 IS All Weather | 15x50 | 237 ft | 15 mm | 19.7 ft | 41.6 oz | 3.3 mm |
18x50 IS All Weather questions
18x50 IS All Weather: does it work with glasses?
18x50 IS All Weather has 15 mm of eye relief, under the 16 mm the RSPB advises for people who wear glasses, so the edge of the view may be cut off with glasses on.
18x50 IS All Weather: what does 18x50 mean?
18x50 IS All Weather magnifies 18 times through 50 mm front lenses, which works out to an exit pupil of 2.8 mm, the width of the beam of light that reaches each eye.